chemistry

Isotopes of palladium

Isotopes of palladium is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Isotopes of palladium rather than just read about it. In short: Natural palladium (46Pd) is composed of six stable isotopes, 102Pd, 104Pd, 105Pd, 106Pd, 108Pd, and 110Pd, although 102Pd and 110Pd are theoretically unstable. The most stable radioisotopes are 107Pd with a half-life of 6.5 million years, 103Pd with a half-life of 16.99 days, and 100Pd with a half-life of 3.63 days.

Key takeaways

Isotopes of palladium belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Isotopes of palladium to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Isotopes of palladium from memory before moving on to harder problems.

Reference excerpt

Natural palladium (46Pd) is composed of six stable isotopes, 102Pd, 104Pd, 105Pd, 106Pd, 108Pd, and 110Pd, although 102Pd and 110Pd are theoretically unstable. The most stable radioisotopes are 107Pd with a half-life of 6.5 million years, 103Pd with a half-life of 16.99 days, and 100Pd with a half-life of 3.63 days. Twenty-five other radioisotopes have been characterized ranging from 91Pd to 129Pd. Most of these have half-lives that are less than 30 minutes except 101Pd (8.47 hours), 109Pd (13.6 hours), and 112Pd (21.0 hours). The primary decay mode before the most abundant stable isotope, 106Pd, is electron capture and the primary mode after is beta decay. The primary decay product before 106Pd is rhodium and the primary product after is silver. Radiogenic 107Ag is a decay product of 107Pd and was first discovered in the Santa Clara meteorite of 1978. The discoverers suggest that the coalescence and differentiation of iron-cored small planets may have occurred 10 million years after a nucleosynthetic event. 107Pd versus Ag correlations observed in bodies, which have clearly been melted since accretion of the Solar System, must reflect the presence of short-lived nuclides in the early Solar System.

List of isotopes

Palladium-103 Palladium-103 is a radioisotope of the element palladium that has uses in brachytherapy for prostate cancer and uveal melanoma. Palladium-103 may be created from palladium-102, or from rhodium-103 using a cyclotron. Palladium-103 has a half-life of 16.99 days and decays by electron capture to an excited state of rhodium-103, which undergoes internal conversion to eject an electron. The resulting electron vacancy leads to emission of characteristic X-rays with 20–23 keV of energy.

Palladium-107

Palladium-107 is the second-longest lived (half-life of 6.5 million years) and least radioactive (decay energy only 33 keV, specific activity 5×10−5 Ci/g) of the 7 long-lived fission products. It undergoes pure beta decay (without gamma radiation) to 107Ag, which is stable. Its yield from thermal neutron fission of uranium-235 is 0.14% per fission, only 1/4 that of iodine-129, and only 1/40 those of 99Tc, 93Zr, and 135Cs. Yield from 233U is slightly lower, but yield from 239Pu is much higher, 3.2%. Fast fission or fission of some heavier actinides[which?] will produce palladium-107 at higher yields. One source estimates that palladium produced from fission contains the isotopes 104Pd (16.9%),105Pd (29.3%), 106Pd (21.3%), 107Pd (17%), 108Pd (11.7%) and 110Pd (3.8%). According to another source, the proportion of 107Pd is 9.2% for palladium from thermal neutron fission of 235U, 11.8% for 233U, and 20.4% for 239Pu (and the 239Pu yield of palladium is about 10 times that of 235U). Because of this dilution and because 105Pd has 11 times the neutron absorption cross section, 107Pd is not amenable to disposal by nuclear transmutation. However, as a noble metal, palladium is not as mobile in the environment as iodine or technetium. These characteristic are shared with 93Zr among the LLFPs.

See also Daughter products other than palladium

Isotopes of silver Isotopes of rhodium Isotopes of ruthenium

References

Worked examples

Example 1 — a first encounter with Isotopes of palladium

Start with the simplest possible case. Write down what Isotopes of palladium claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Isotopes of palladium before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Isotopes of palladium ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Isotopes of palladium

In research: Isotopes of palladium appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Isotopes of palladium in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Isotopes of palladium is common in secondary-school and first-year university syllabi. It links to neighbouring topics Isotopes of palladium, Lists of isotopes by element, Palladium, so understanding it makes those chapters shorter.
In everyday life: Look for Isotopes of palladium outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Isotopes of palladium in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Isotopes of palladium means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Isotopes of palladium out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Isotopes of palladium in simple terms?

Why does Isotopes of palladium matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Isotopes of palladium?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Isotopes of palladium.